Tangent bending apparatus with work holding dies



L. B. GREEN Sept. 20, 1949.

TANGENT BENDING APPARATUS WITH WORK-HOLDING DIES 5 Sheets-Sheet 1 Filed Jan. 9, 1945 INVENTOR. LEE 5. 6/955 4M Ma m 4 91mm firm/aways P 1949- L. B. GREEN 2,482,617

TANGENT BENDING APPARATUS WITH WORK-HOLDING DIES Filed Jan. 9, 1945 5 Sheets-Sheet 2 IN V EN TOR.

BY I 1M mm 5% A 770/? NE )0 B. GREEN Sept. 20, 1949.

TANGENT BENDING APPARATUS WITH WORK-HOLDING DIES 5 Sheeis-Sheet 3 Filed Jan. 9, 1945 mmvroza. 1.55 5- 625m HTTOR/YEJS J I A 2 i :M fi

Sept. 20, 1949. v 1.. B. GREEN 2,482,617

TANGENT BENDING APPARATUS WITH WORK HOLDING DIES Filed Jan. 9, 1945 5 Sheets-Sheet f1 l 54 I N r J! i l l I INVENTOR. v LEE 5. GREEN H5 10. BY

1m mmzfl zffl, 2 m

Sept. 20, 1949. L. B. GREEN 2,482,617

TANGENT BENDING APPARATUS WITH WORK-HOLDING DIES Filed Jan. 9, 1945 v 5 Sheets-Sheet 5 VINVENTOR. LEE 5. Gene's/v BY j/M J A T 70/? N575 Patented Sept. 20, 1949 .flj g g.UNITED STAT ES 1 PATENT,

OFFICE TAN GENT BENDING APPARATUS WITH WORK HOLDING DIES Lee B. Green, Lakewood, "Ohio Application January 9, 1945; Serial No. 571,979'

10 Claims.

1 1 Another object of this invention is to provide an improved bending machine of the character mentioned, whichis of a more simplified and 7 compact construction than the bending machines heretofore proposed and in which the bending operation is carried out by moving a bending die upwardly and around an anvil die .so that either individual or successive bends can be readily made in thework material and such that the material being bent swings upwardly ton-n out-of-the-way position.

;A further object of this invention is to pro- ,vide an improved bending machine of this character, having a novel relative arrangement for the anvil'die and bending die such as to enable work material to be readilyied to the machine from a convenient working position at the front thereof and which will readily accommodate work material of any width or length within the capacity ofthe machine.

Still another object of this invention is to provide an improved machine of this kind, having .novel means for mounting and actuating the movable anvil and bending dies so as to effectively accomplish the desired work clamping and bending operations.

Yet another object of the present invention is "to provide an improved bending machine of the character mentioned, which is readily adaptable for carrying out the bending operation so that the relativerocking between the bending and anvil dies will be accomplished either as a wiping action; or as a rolling action withoutrelative slippage, depending upon the characteristics and requirements of the work material.

The invention can be further briefly summarized as consisting in certain novel combinations and arrangements of parts hereinafter described and particularly set out in the appended claims. In the accompanying sheets of drawings:

Fig. 1 is a side elevation showing one form of bending machine embodying the construction of the present invention.

1 and showing the work material with only one bend formed therein.

Fig. 3 is another side elevation similar to Fig.1

but showing the work material with two bends formed therein. 7

' Fig. 4 is a front elevation of the machine show ing the same on a larger scale.

Fig. 5 is a longitudinal sectional view taken through the machine on line 55 of Fig. 4.

Fig. 61s a partial plan view of the machine.

' Fig. 7 is a perspective view showing the cylinder and linkage for actuating the anvil'die'ior clamping or releasing the work material.

Fig. 8 is a partial vertical sectional view taken substantially on line 8-8 of Fig. l. n

Fig. 9 is a partial vertical sectional viewitaken on line 9-9 of Fig. 6.

Fig. 10 is another partial vertical sectional view taken substantially on line 18 -40 of Fig. 5.

' Fig. 11 is a partial longitudinal sectional view taken through a modified form of the improved bending machine.

Fig. 12 is' a similar partial longitudinal sectional view taken through another modified form of the improved bending machine.

Fig. 13 is a partial transverse section view taken through the modified bending machine of 'Fig. 12, the view being taken substantially on line 'l3"l3-of Fig. 12. p

Fig. lei is another partial longitudinal sectional view'thereof taken'on line l4l4 of Fig. 13.

Fig. 15 is a transverse sectional view of the work "material being bent in Figs. 11 and 12.

' Proceeding now with a more detailed description of the present invention, I 'will describe first the machine or'embodiment which is illustrated in Figs. 1 to 10 inclusive and wherein thewwork material being bent is shown in this instance as being in the form of pipes'o'r tubes Health,

and I00 of different diameters. This machine comprises in general an upright frame I I provided with cooperating die members and with a hollow structure orwing which is pivoted onthe bending die It? which is actuated by the wing l2 for'rocking cooperation with the anvil die.

'The frame H comprises an upright hollow structure having laterally spaced substantially parallel side walls l6 and I! which are con- Fig. 2 is a partial side elevation similar to Fig. 55,

-nected adjacent the bottom of the frame by meansof a substantially horizontal floor portion I8 and are also connected adjacent the front of the frame by a laterally extending upright wall IS. The wall I9 extends for only a portion of the height of the machine, as shown in Fig. 5, and at its upper edge is provided with a laterally elongated ledge or overhang 20 which forms a table portion or mount for the die member or work support l3. Rearwardly or inwardly of the table portion 20" the frame M is also: provided with a laterally: elongated substantially 'horizontal table portion 2| which extends between the side walls l6 and [1. metal plate which is suitably-supported rat-sthe front of the machine either on the table :portion 20 or on the die member l3 and at the rear of the machine by the crossbar 21a. Suitables'tops or gauges 22 and 23 are provided onthe stable portion 2| for cooperation with 'the inner end or ends of the work material when th'e' latter'is inserted into the machine from a working position in-front-thereof. :Addition-al transversework supports 24 can be provided at rappropriate heights above the table rportion -.2I ifneede'd or "desired. The. table yportion 2| andthespaced uprights forming the side walls lfi and-l 'l-define a compartmen-tiin'the lower-i portion of the frame which houses certain 'pressurefluidzapparatusdescribed hereinafter.

The, anvil =die l4--.is supported-and actuated "by a -movable carrier 25 which is .-here shown as being arsubstantiallw U -shaped'member having a transverse :front portion 25a=to which the anvil die is bolted-or otherwise suitably connected and :a pair-of laterally spaced rrearwardly ext-ending arms 251) which lieijust inwardly ofsth-esidewalls -I-6:and l-| 'and: are pivot-ally connected .with the latter by means of the pivotzpinsz'zfi. Pairs-oncoioperating-zguide elements 21:and ::28-iare; provided ontheccarrier 25 zand'the sidewalls of :the frame l lsfor confining andiguiding theicarriertduring its vs swinging movementin the" frame. fi7l/'.i tl'r:;the carrier 25 mounted in the frame I lias just: described, it will :be: seen ithati-lowering -sand lifting of "this carrier willicause. the ianvil rclietzi4 toabe 'moved toward or awayifrom:thework:supportingzdie-l3 F so asitotcooperate: :th'erewitn forzzclampingncr. re-

iiea'sing: the workmaterial.

' .Thercarrieri 2 :can" becactuatedtby :any. suitable power means and in this instance'Irshowga-dou- 'ible. ac'tingrflnid'pressureicylinder: 30. tor..=this:pur-

pose. The cylinder. 30: is :preferiablyza: hydraulic cylinder'ihaving fconnections -3 I wand. 32 .at ithe upper and lower 7 ends lthereof'ifor'; snpplying'ior exhausting the: actuatingi liquid-which is jprefera- T blyea: suitablei'oil. Theicylind'err 301188? a recipro- ."cablmpistonI-therein from -whi'chzaipiston-rod '33 "extends .through the upperend of the :cylinder and ;is"attacheditO' a lever 2 34, the "latter 'being keyed or otherwisetconnected to a transverserock sh'aft 35. .A pair :of;levers;.=36-spaced axially of i'the rock shaft '35 "andi keyed.ithereto are "connected with fthe arms 25b :of :the 'hcarrier -25 "as rby means er thetzli'nks 31. .Thelower-zend of ithe cylinder-'30 is anchored on .thesfloor tportion'i l 8 COf'itheF'frame E'as fbymeans "ofrfthe'ipivotal con- The table portion 2| is formed-of In the arrangement just described it will be seen that the cylinder 30, the tank 39, and the electric motor 4| which are supported on the floor portion 18 are all housed in the hollow frame H. The wing l2 which actuates the bending die 15 comprises a laterally elongated generally flat piate-like hollow structure or body which extends across the front of the machine and is provided "adjacentsitsaends with -a pair=.of:;supporting arms 44.- TheLarms 4'4iare prnvided'zwith'suitable bearings at their outer ends by which the wing is :pivotally mounted on a pair of substantially aligned pivot pins 46 which project laterally out- =wardlyin opposite directions from the sides l6 and ll of the frame H. The pivot pins 46 are -'disposed substantially coaxially of the laterally elongated anvil die I4 so that the wing l2 can be swung 'forwardly'and upwardly around the anvil rdiexas will be explained more fully hereinafter.

"includes a diecarrier in .the' formgofnaaplateifl which is located between the space'dnrms 244-.an'd extends in. a direction substantiallmnormal utolthe general plane of then-hollow .bodynoif .the wing. The plate :50 is elongated. laterally of jthe :machine and formsiaucarrierifor .thehendingliitij [5, this die being bolted or otherwisesuitably attached to the plate von .the .upper side.,-thereof. .The plate 553 is provided.atothemdsltheltedff with cal-pair of spaced .armseorjyokesfil whiohhave pivot recesses .52 in their. .upper .or. outer .ends and which recesses are-rockable.on, pivot pins'i53 which extend inwardly from the side .wallsxltand H of theirame ll .insubstantially coaxialgalignment with the previously ..mentioned .pivot pins 460f the wing 12.. .The yokerecessesifiland the pivot pins-53 constitute cooperatin 'lfulcrum elements by which the plate .50.?is mounted "-for swinging movement on;the"frame"ll whilehe'ing carried by thewwing l2. .fAs ,shown, inFig. 9ijthe oppositelysextending. pivot .pins 46 .an'd 53m are carried by an..adaptorfbody- Ila, whichrextenids through an .opening of the .side wallfi'l 'and'iis bolted=thereagainst.

:The. wing 'l2.--also .includesa pressure rollert54 and a pair of laterally spaced supporting rollers 55 located outwardly of,,or .tothei;front.ofythe pressure roller. The pressure. roller 54 is .shiftably. mounted in the hollow body of the wing with its opposite ends extending outwardly throughthe openings 12c andis held in engagement with the underside of the plate 50 by.means of thecompression springs 56. "These springs actto urge the bending die Howard the. anvil "die' Mfonapplying pressure to. the workmateriar'during the bendingoperation and also actto yieldably-hoid the above mentioned cooperating fulcrum ,elements. 52 and 53 in .engagementwith each other. The springs'56 .are disposed in the. end openings v.I 2c of the wing 50 as to extend between the spring seats 56a and the shiftable bearings' 54a-ofjthe roller 54. The compression of the springs 56'can be varied'or adjusted'b means of the screws 51 engaging the spring seats 56a. The-rollers 55 support the forwardly extendingor "overhanging portion of the plate 50 and efiectively-prevent' any excessive relative rocking or tilting "of the plate.

Relative slipping between the 'suriace of fthe pressure roller'54 and the undersideofytheplate 50 is prevented by providing the 'roller-withaxial- 1y spaced pinions or annular groups "of1teeth58 "which mesh-with-racks 5-9-provided onthe'underside of the plate adjacent the ends thereof. The inner rear longitudinal edge of the plate 50 carries a projection or flange 66; preferably beveled, which engages under a lip or flange 6| provided on the table portion 20 of the frame for assisting in supporting the plate when the wing I2 is in its lower position corresponding withthe initial position of thebending die I5. The liplil will insure accurate alignment of the supportin and bending dies I3 and I5 and will act as a stop .for taking the thrust of the pressure roller 54 while the wing is in its lower position and while the work material is being inserted into'the machin from the front thereof. The wing I2 isactuated by power means preferably in the form of aipair of. hydraulic cylinders 63 located just outwardly of the upright side walls I6 and I! of the frame II. The cylinders 63, have suitable connections 64 and 65 adjacent their ends for supplying and exhausting the mo-.

tive fluid. These cylinders are disposed in relatively inclined relation so that their thrust can be applied to the wing in a direct and effective manner and have their inner or rear ends anchored on the frame I I as by mean of the pivotal connection 66. The cylinders 63 have reciprocable pistons therein attached to piston rods 6! which project from the front or outer ends of these cylindersand are pivotally connected to the spaced lugs 68 of the wing I2 by means of the pivot pins 69. When pressure fluid is supplied to the inner ends of the cylinders 63 the wing I2 is swung outwardly and upwardly on the pivot pins 46 to or toward the broken line position shown in Fig. 5, thereby causing the bending die I5 to travel around the anvil die I4. When pressure fluid is supplied to the outer ends of thecylinders 63 the wing I2 is returned or lowered to-its full line initial position shown in Figs. 4 and 5.

The pressure fluid for actuating th cylinders 63 is supplied thereto by the above mentioned pump 40 and is controlled by suitablevalve means (not shown) adapted to be actuated by a control lever 10. A similar lever II is provided for actuatin suitable valve means (not shownifor controlling the supplyof pressurefiuid to thecylinder 30 which causes opening and closing of the anvil die I4. The levers 10 and II can be located on the side wall I6 of the frame II at a conveniently accessible point as shown in Fig. 1. A suitable electric switch I2 is also located on the frame adjacent the levers Ill and II and controls the operation of the electric motor 4|.

The cooperating die members l3, I4, and I5 will be described next. The stationary die member I3 forms a work support, as mentioned above, against each of the die members I3, I4, and I5 comprises three sections which extend laterally of the machine in substantial alignment. 7

The sections of the stationary die member I3 are designated I312, I319, and I 30, all of which are bolted or otherwise attached to the table portion of the frame II. The anvil die l4 comprises corresponding sections Ma, Mb, and I40, which are bolted to the transverse portion a of the-die 6 carri'er 25. The bending die l5 comprises corresponding sections I5a, I51), and I 50, which are bolted or otherwise attached'to the plate '50 of 'thewingIZ; I 1 The anvil'die l4is constructed of a shape to provide a rounded forward portion"! 5 (see Fig. 5)

around which the work material is to be bent, and a rearwardly extending substantially straight portion I6 which cooperates with the stationary 'diemember I3 for clamping the work material against the latter; The stationary die member 13 and the bending die I5 are both plate-like structures-which'are straight, as distinguished I from the curved portion I5 of the anvil die I4. When the cooperating die members l3, I4, and I5 are intended for usein bending pipe, as shown in this instance, they are provided with grooves or recesses having a transverse curvature corresponding substantially with the outside diameter of the pipe to be received therein. The grooves "II of this character which'are provided in the anvil-'die*- I4 extend continuously around the curved portion I5 and along the rearwardly extending straight portion 16-. The'corresponding grooves I3 and I9 of the die members I3 and I5 extend across the latter die members from the front to the back thereof, with the grooves I9 of the die member I5in substantial alignment with the groove 78 of the die member I3. The grooves I8 and iii'of'the die members I3 and [5 are oomplemental to the grooves 11 of the anvil die I4, so that approximately one-half of the pipe to be bent is contained in the grooves of the die members I3 and I5, and the other half of the pipe is contained in the groove ll of the anvil die I4.

When the pipes are to be placed in the machine, the cylinder 30 is actuated to lift the carrier 25, thereby opening the anvil die I4 relative to the worksupporting die I3 so that the pipes can be inserted endwise into the aligned grooves of the die members I3' and I5. When the desired number of pipes have been inserted into the machine, the cylinder 30 is actuated to lower the anvil die l4; thereby clamping the pipes against the stationary die -member I3. The machine is now loaded and ready for the bending operation, which is carried out by actuating the cylinders 163'so as to swing thewi'ng I2 upwardly to or toward its broken line position shown in Fig. 5. During this swinging of the wing I2 the bending die I5 travels around the curved portion of the anvil die 4 and bends the pipes against the curved portion of the latter so that they assume a corresponding curvature; The bending opera- .tion canv be accomplished by one or more such strokes of .the wing I2 as may be needed, after 'whichthe wing is returned to its initial position in .which it is shown in full lines in Figs. 4 and 5. The'curvature or shape to which the pipes or other work material v.isto be bent is determined by theshape or curvature of the rounded forward portion of the anvil die l4. By substituting different anvil dies of'appropriate curvature in the has the largest radius of curvature,- and tlie die' esection; I49 which handles the smallest size pipe I00 has the. smallest radius of curvature. vThe intermediate ,die section Mb which handles. the

.l .interme.diate;size-zo .pi e iliqbahasfin intermediat eadiusofrcuritature. V i

. Theth kn t thesii members t3 andatfi depends upon the radius of curvatures ofztheanvll ed eiliiandithethicknessoftim d fi rentsecti ns 10 .i he ie members 1 l 31ammavariesisee Fi s. 4 and 10) with ,the 'yariation: ingthe.:;curvat ure of .the:. 1i ferentsections; o tthe: .anvi1 ..di aimther -W ds the sections ;3 3. I1d(155a;:WhiChiCQOPCIQIbQ 1 :8 bendin .operations on ,-thex-metal;.-=sheetnor pIate'IBI. In Fig. 11- the anvildiezBZ haaarlelati-ve1y, sharp front ed e 83,: around which-th 'rplate BI ;is bent and a vsubstantially ,flatjlower 5 face 84; for elampingcooperation with the flat upper gface. :85 ;of ithe gstationary die rmember: .186.

The bending die :81 is carried by a plate :88 mi .the Wing 89, and has .a substantially fiat working :surface 199 pwhich travels .or swings around :the

i lltithatheeectionl4a:0htheganvil,die ;are:of; minanvil; die 82 during the swinging f=the .wing.

thickness, ;-and theysections 13c and -lc hich:,coopelfate.-withg the.;.secti on; Hoof: the-anvil e, re of -maximurn thickness. Thermtflmeections isb-gal'id l;,5 bwhich; cooperate with itermediate-thickness.

I carrying --out -;the bending 1 operation. in :the .ferm. of 1 the .machine illustrated in -l?igs. lto, .;inelnsive in which the. plate 50 of the Wing 12; is giiulcrnmeionthe; irame -I iby means ;of ,the;pivot :IeCQS SS-,5 -3 piwthe yokes or arms.52,. the moveyment ofgthe bending die 5 5 around, the ,anvil die t4 takes place -.with,; a 1 wiping action. Likewise, will :this; form ;ofthe machine the plate 5 0 does not itra-vel through or transversely of the wing .l2 2

..- f the; plate was tozapplyits pressure-substanit altylon ;a radial line Which passes through the commompi-vouaxis aboutwhichthe-wing l2 and ;;.the;-plate .51) are swung. ,The combined swing- .ingmevement-of the-wing I2 and the pressure .of :the roller. causethe bending die IE to bendthe work: matfirialsmoothly ,to i the desired shape or .radins substantiallywithout, theformation of any irregularities or -:wrinkles inthework material. i;;-Figs.,-.1,; 2 -and;3 illustrates the above described Feperation l the machine in a -somewhat diagrammatic -manner. Fig. 1 shows .-.the =pipes lillq tllb and l 90 ashaving been inserted-intmthe .rnaclnne and-eshowsthe wing iZvready to.begin hits gupwardcswing, for; the-bending operation- .-Fig. .Z-[ShDWS the machine -at.thecompletionlof the first -bendingoperatiomeat whichutime. the -.-wingl2:;is ,inrangalevatedr iorwardly. extending position;. and the....bent .portions of.the-pipes Alia, .llllpand ,Hic extend upwardlyv above the machine in anout-of- .the-waymosition. ,Fig. 3 showsthe machine at .,the .completion .of a ..second bending. operatien ..which has, been performed-upon thesame groups lof pipes..lfia,iltb..'and. Ito. ...In this improvedma- ,chineit will..be,.see,n,that whena, second bendis 'iormedin the work material.theprYiQllSllLberit .iwrtiqn, is deflected or swung toward the, rearpf the machine, sothat a minimum amountofQfloor spac is needed to accomm date this ma a ithejbending. operationsperformed thereby.

Instead, of using the machine for bending l ups-ofp p s as b v e pla ned it an s b usedi ben in metal s eets .orthel e any desired radius of .curvature, or to., a relativ ely sharp angularbend as shown in Fig. 1.1. ;"When the-machine is used to operate on metal. sheets or platesflfor this' purpose, it will be'understood ;of course thatthe above described complemental ;grooves are omitted from --the cooperating -die members andthe workingsurfaces of these die rnenrrbers will be smooth or fiat.

* Fig. 11 shows a modified' -bending g-m'achi-ne which is substantially identical with that; illus- -trated infFigs. 1- to l0 inclusive, with-the exceptign-ot the die -members,--which-in this view are *shown "as 'being provided with the above mentioned smooth or flat Working faces-fer performtermediate gSQQtiQIlc; Mb; of theanvil die-;- are is} "In Figs.;112, 13 and 14 I show anotherrmodified iiormof the aboveyidescribed bendingv apparatus. :Inthis modified;construction the bending-machine is substantially identical withthe machine illustrated in.. Figs.il to 10 inclusive, with theexceptionof .the cooperating :dieamembers ande the manner in which the plate 92 ofthe wing rfl3 is efulcrnmedion .the:;frame.:of .the machine. The .dies embodied in this-modified-form.of bending -machinegiinclude .an anvil die 94, a stationary -workasupporting die 95 and a bending die 96. The anvil die has a rounded forward portion'ki'l which may be. of any desired radius of curvature and around which the .metal sheet 98 -isbent. The anvil --die 9'2 also *has a substantially-flat lower face 99 for clamping cooperation with the :fiat upper face H38. of the die member'95. The "bending: die :96 has a substantially flat inner side face I0! which comes-into substantiallymeeting 0 relationwith a corresponding faceon the-die operation.

"Inoperating on certain kinds of'work suchas the metal sheet Qt-shown in this instance, it-is desirable that the bending die-96 travelaround the anvil die-94 with a true rocking-motion' substantially without any relative slippage *therebetween. To accomplish this the arms or yokes H34 located at -the-- ends of the plate 92 are; pro- -'v-ided-'with racks -I-B5-which mesh with gear sec- "tors l flfi-provided on the framefof the machine.

The racks I05 and the gear sectors; I96 with .50 swinging or rockingof the plate-92 aroundjthe anvil-die-94-on substantially-the same, pivot axis as thewing 93 during the bending operation.

When the bending operation is carried out'in *gthis modified 'form of machine shown in Figs. l2

,5 to 14 inclusive, the plate 92 which carries the *bending die -96 has some relative movement through or transversely ofthe wing; 93 as the'latter-is 'swung upwardly about its pivotaxis. This relative movement of the plate-92 accompanies '60 therocking -movement "around the anvil die 94 i which is compelled by l the meshing engagement of the j racks and: sectors 1G5" and H16 and takes place substantially in the plates IOWII plane and substantially normal to thebodyof 'the wingi93.

05 *During this-movement of theplate 92-re1ativeyto the wing 93, the point of engagement of the pres- -sure-rol-ler Hi8 travels alongthe-underside of'the plate-but relative slippage between thepressure roll and plate is-prevented by the teeth IfiS-of *--theroll=engaging in theracks i It of'the plate. If

the metalsheet -98 being bent has edge flanges J H --thereon,:-as-shown in Figs. 12, 13 and'lS; the bending-dial; is provided-withangular or upstanding flange portions 1 [2 at the ends-thereof,

I -whieh cooperate with end" faces of f the anvil-die 94 for ironing the flanges Ill and holding the same from wrinkling during the bending operation.

-When the bending operation is to be carried out with the above described true rocking action of the-bending dierelative to the anvil die, the machine is used in the form shown inFigs. 12, 13 and 14 in which the plate, 92 of the wing has the above mentioned racks H15 on the arms or yokes thereof and the frame is provided with gear sectors I06 with which such racks cooperate. The bending machine shown in Figs. 1 to 10 inclusive, which performs the bending operation with a wiping action, can be readily adapted or converted to the rocking type of machine, by merely substituting therein a plate of .the character shown inFigs. 12,. 13, and 14,, in which the arms or yokes I04 are provided with the racks I05 and by substituting the adapter fittings H5 in the frame openings l I 6 in'place of the fittings I la shown in Fig. 9. As shown in Figs. 13 and 14, the adapter fittings H5 have outwardly projecting pivot pins II'I. thereon, corresponding with the pivot pins 46 of Fig. 4, and on which the arms of the wing 93 are pivotally mounted. The gear sectors 106 are bolted or otherwise attached to the plate portions H8 of the adapters H5, with the centers of the gear sectors lying substantially on the common pivot axis of the pins 1 ll and the curved portion 91 of the bending die 95.. This 1' such that these machines can be simpler and more compact than has heretofore been the case, and the improved machine is capable ofcarry- "ing out bending operations in a rapid and satisfactory manner on various'kinds of work material including sheets, pipes, tubes and the like.

It Will be seen also that the imp-rovedconstruction provides a machine which will accommodate, or can be easily adapted to, various widths and lengths of work material and that such material can be readily inserted into or removed from the machine from a convenient working position at the front thereof.

While I have illustrated and described my improved bending apparatus in considerable detail,

it will be understood of course that I do not wish to be correspondingly limited but regard my invention as. including all changes and modifications coming within the spirit of the invention and the scope of the claims hereof.

' Having thus described my invention, I claim:

'1. In a bending machine, a frame having laterally spaced uprights and a substantially horizontally elongated work support between said uprights, substantially horizontally elongated anvil die, means above said work support and substantially coextensive therewith, means mounting said anvil die means on said frame for movement toward and away from said work support for clamping work material therebetween, a substantially horizontally elongated structure mounted on said frame so as to' swing upwardly around said anvil die means, substantially horizontally elongated bending die means carried by saidstructure and cooperating with said anvil die means for bending a portion of said material upwardly around the latter during the swinging of said structure, the mounting means for said anvil die means comprising elongated members lying adjacent said uprights and pivoted thereon at a point remotefrom said work support, a laterally extending rock shaft journaled in said uprights, a power cylinder located between said uprights and operably connected with said shaft to rock the, same, levers connected with said rock shaft adjacent said uprights and extending in a direction away from the pivots for said elongated members, and links pivotally connectedwith said levers and said elongated members for actuating the latter from said rock shaft. a

2. In bending apparatus, a frame, elongated anvil die means on said frame, means substantially coextensivewith said anvil die means and cooperating therewith for clamping work material therebetween, an elongated structure having pivotal connection with said frame at points outwardly of the ends of said anvil die means so as V to swing around said anvil die means on an axis substantially coextensive therewith, means for swinging said structure, an elongated plate separate from but carried and actuated by said structure and having spaced arms fulcrumed on said frame for movement of said plate with said structure and substantially about the pivot axis of the latter, bending die means carried by said plate and cooperating with said anvil die means for bending thework material around the latter during the swinging of said structure, a roller carried by said structure and engagingsaid plate, spring means actingon said roller for urging said bending die means toward said anvil die means, and cooperating gear teeth in meshing engagement-on said roller and plate.

'3. In. bending apparatus, a frame, an elongatedwork support on said frame, elongated anvil die means substantially coextensive with said work support and movable toward the latter for clamping work material therebetween, an elongated structure having spaced pivotal connections with said frame at points adjacent the ends of said anvil die means so as to .swing around the'latter on an axis substantially coextensive therewith, means for swinging said structure, a plate carried by said structure and extending substantially normal thereto, said plate being supported by said structure so as to be capable of relative movement substantially in its own plane and transversely of said structure, gear sectors on said frame adjacent said Pivotal connections, spaced arms projecting from one side of said plate and having racks thereon which mesh with said gear sectors, bending die means on said one side of said plate and cooperating with said anvil die means for bending the work material around the latter during the swinging of said structure, racks on the other side of said plate, a roller engaging said other side of the plate and having gear teeth thereon which mesh with thelast mentioned racks, and resilient pressure means acting through said roller for urging said bending die means toward said anvil die I means.

4. In a bending machine, a frame having laterally spaced uprights forming the sides of the frame and a horizontally elongated work support extending between said uprights at the front of the frame, said uprights being of a width such that said frame has a substantial depth and being of a height to extend above the plane of said menses; acernerideetedstave said work -sup' 156a and between-said uprights and havingiear' waidiil eiiteridin'g' arms pivoted on said uprights adjacent the rear oftl'ie fraine; a horizontally elongated aiiv'il die" mounted on said carrier for iation with'said w'c'irl i' supportin clainping work materialthreagainst, a horizontally elongated Wing pivotall mounted on said frame ad jac en'tftlie front thereof so'a's to swing forwardly andupwardiy around said 'afilVi1 die, a horizontally elongated bending" die carried by said wi'ng and adapted to cooperate with said anvil die for bendmg said work atered upwardly around the 1st: tel; rrie'aiis for imparting suc'h forwar'd alidfiipj ward swinging movement to said wing, a later any" extending rock" Sh ri;- ournelled' iii' said uprights and having levers mounted thereon ad; j-acent"said uprights, a' power cylinder operably corinectedwith'said rbck shaft to'ro'ck'tl'ie same; and linls-"pivot"ally connecting said levers with said arms for actuating said carrier from" said rock' shaft';

5 Inabendingmachinaa framehavinglaterany spaced uprights formiiig' the sides of the" name ahd'ahorizontally elongated worksnpport itending betw'een said uprights atthe' front of the frame," said uprights being of' a width such that said'f'r aliie has" a' substantial depth and be" iiigmf'a height toexte'iid above the plane of said worksupport at the froiit and rear portions' oi the 'frame; a carrierilodatedabove said work sup port and between s'aid upright's and having rear Wardly extending arriis lying adjacent the 1 inner sides'iof the uprights and pivoted on said up rightsi'adj-acent"the-rear ofthe frame, ahorizdhtaily: elongated anvil die mounted oxisa'id carrierfor' cooperating with said" work support in clamping work material thereagainst; a hori-' zontally elongated wing having" horizontally spaced arms pivotall'y mountedon said'frame'adj-a'cent" the frontthereofwiden the outer sides of sai'cl 'uprights" so as to swing forwardly a'ncl'up wardlyaroundsa'id anvil die,'ahorizo'ntally elon gated bending die carried by said wing and 1 adapted'tocooperatewith'saidanvil=die for bend ihg said work materia'lzupwardly around the lat ter',means*ior irnpartihg such forwarda'nd up ward swinging movement to said Wing compris ing a-"pair of pressurefluidresponsivecylinders pivotally mounted onsaid uprights on'the outside thereof and-operably connected with said wingat', corresponding horizontally spaced points, a laterally extending. rock shaft journalled'in said uprights and having levers mounted thereon ad jac'ent' said uprights, azpower cvlinder operably' connected; with said rock'- shafttorock the same, ancllinks" pivotally connecting said' levers with said'arms: for actuating said carrier from said rock shaft.

r 6.- In bending; apparatus; a frame; laterally 1 arcuate indveriint of s'aid platearound said ani il die meanswan said structure" and substantially or the latter -bending die -pl'ate'and cooperating wi teiia around the'f latter during the swinging-of said s nature; and" re iliently acting pressure means c'arri'edby said structure and acting- 'co'n' tinuously on said plate)" for ur'gingsaid ben'diii'g aiemeans tbwam said anvil die' means? 1 7 In bending apparatusya i ain'e' 'having atthc? front 'thefeof' a laterallirelongated "work support mg portion iiiiiluding a Iate'raIIy elongated tor when overhanging lip; a'-latera11yelongated work supportifig'die oii said'worksupporting por' tion, laterally" elongated anvil-'- die meansabove said work supportingtdie; a' movable' carrier forsai'd -a'nvildie meansand mounting the latterfor movement toward i said work supporting die"- :fo'r' claniping workmaterialagainstthe latter; astruc' i' tur'e clon'gated in'the direction of said anvil die means" and" having spaced arms pivotally con-'- nested with said frame outwardlyof the" ends of said anvil' die m'eans soas'tomount said'struc tuie onsaid frame for swinging from-' an initialdepending position-in a 'dire'ction forwardly and upwardly areund'said anvil *die means: means for swinging said' structur, roller means-carriedby said structure, a 1ate-'= disposedbetween said spaced' arm's and extending substantially normal to the plane of said structure andjsupported bysaid roller'means 'with-aforwardly extending-portion of theplate:overhangingsaid roller means,- ooopera'ting-means-"on said frame andplatefor fulcruming the-"latter on said: frame during the; swinging ofsaid-structure; laterally elongated bending die means carried by :said plate-and 00- operating withsa-idanvil-"die means for bending the work material around the' latter' during said swinging of-said'structure?pressure means actingag-ainst' saidplate through said IO]1 ljm6allS for urging the bending die meanstoward said anvildie means, and a laterally elongated rearwardly p 'oj ecting ledge on said plate and engageable an der said;overhanging-dip whensaid structure is in saidinitial position for assisting in supportingthe'pverha ig ing'fportion of said plate H 4 8. In bending apparatus, a; frarna a laterally elongated work supporting die on said frame-at the" frontth eo'f, laterally" elongated anvil die means above said work su'fip'ortmg' die, a movable car e'rf' for said anvildiem axis and niounting the attei ormat iile'iilf toward saidworl; sn "-1 psam'g' die" for dam ing wdrlil'fiiateriial against the l'i-ttf, alat''ra y 610 h laterally spaced plvot'e'd 0h said frame for swizigrg of said strue'ture'j forwardly endopwegdiy ar uses-em an" s on an axis substan't "llypo'exte he" latter, means i gsaid sin'uctur'e, a laterally elongated plate sepa e r piii bdt car'ried and actuated by said srrseii e ween e supportedthereon' be: tween the air, the of and exten ing substan may stami a theplane ofisaid striibtii'le; said plate having 'aT'ms mending from one side the eo'f and adjefc it its ends,- gea-i' sectors-on s the ends said anvil 1e arms or said plat mane-v A geifi'nt with said gear 5 sb as t'opeifii rhdv mentor sa l ture during the swinging of said structure, bending die means carried by said plate on said one side thereof and having rocking cooperation with said anvil die means for bending the work material around the latter during the swinging of said structure, and resiliently acting pressure means carried by said structure and acting on the opposite side of said plate.

9. In bending apparatus, a frame having laterally spaced uprights, a laterally elongated work supporting die on said frame at the front thereof, laterally elongated anvil die means above said work supporting die, a movable carrier for said anvil die means and mounting the latter for movement toward said work supporting die for clamping work material against the latter, a laterally elongated structure having laterally spaced arms pivoted on said frame on the outside of said uprights for swinging of said structure forwardly and upwardly around said anvil die means, means for swinging said structure, a laterally elongated plate separate from but carried and actuated by said structure by being supported thereon between the arms thereof and extending substantially normal to the plane of said structure, said plate having arms projecting from one side thereof and adjacent its ends, gear sectors on said frame adjacent the ends of said anvil die means and located on the inside of said uprights, racks 0n the arms of said plate and having meshing engagement with said gear sectors so as to permit movement of said plate substantially in its own plane and relative to said structure during the swinging of said structure, bending die means carried by said plate on said one side thereof and having rocking cooperation with said anvil die means for bending the work material around the latter during the swinging of said structure, and resiliently acting pressure means carried by said structure and acting on the opposite side of said plate.

10. In bending apparatus, a frame having laterally spaced uprights, a laterally elongated work supporting die on said frame at the front thereof, laterally elongated anvil die means above said work supporting die, a movable carrier for said anvil die means and mounting the latter for movement toward said work supporting die for clamping work material against the latter, a laterally elongated structure having 1aterally spaced arms pivoted on said frame on the outside of said uprights for swinging of said structure forwardly and upwardly around said anvil die means, a laterally elongated plate separate from but carried and actuated by said structure by being supported thereon between the arms thereof and extending substantially normal to the plane of said structure, said plate having arms projecting from one side thereof and adjacent its ends and fulcrumed on said frame for movement of said plate around said anvil die means with said structure, a laterally elongated bending die carried by said plate on said one side thereof and cooperating with said anvil die means for bending the work material around the latter during the swinging of said structure, resiliently acting pressure means carried by said structure and acting on the other side of said plate for holding said bending die against said anvil die means, and a pair of hydraulic power cylinders mounted on said uprights adjacent the outer sides thereof and operably connected with said structure for imparting the swinging movement thereto.

LEE B. GREEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 285,922 Pessenger Oct. 2, 1883 338,079 Kittredge et al. Mar. 16, 1886 468,582 Schneekloth Feb. 9, 1892 634,293 Gill Oct. 3, 1899 839,839 Hallowell Jan. 1, 1907 1,662,131 Schonfield Mar. 13, 1928 1,773,430 McDonnell Aug. 19, 1930 2091,749 Christman Aug. 31, 1937 2,190,423 Henric'son Feb. 13, 1940 2,287,933 Green June 30, 1942 2,343,441. Babcock et al Mar. '7, 1944 FOREIGN PATENTS Number Country Date 808,486 France Nov. 14, 1936 

